For those reading Cisco Press' CCNP Routing Exam Certification Guide: Sorry
to
bother you again.
Chapter 4, page 178, suggests the use of TCP to exchange OSPF hello packets:
"... To understand this complexity, it is useful to identify the main
characteristics of OSPF. These key attributes of OSPF include the following:
- Maintaining a connection-oriented relationship with other routers on
the
same physical segment. These are known as adjacent neighbors. This is a TCP
connection maintained by keepalives ...."
I haven't checked the OSPF RFC yet, but I don't believe that the hello
protocol uses a TCP connection. Hello packets are implemented by OSPF packet
type 1 and use IP protocol type 89 that is exclusively defined for OSPF
traffic. Probably authors mixed it up with BGP?
Does anyone have an errata for this cert. guide? I can't find it on Cisco
Press web site.
Thanks,
Eric
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